Hyparrhenia barteri

HABIT Annual; caespitose. Butt sheaths glabrous. Culms erect; 100–200 cm long. Leaves cauline. Ligule an eciliate membrane; 1 mm long. Leaf-blades 15–30 cm long; 2–4 mm wide. Leaf-blade surface scaberulous.

INFLORESCENCE Synflorescence compound; fasciculate; 30–40 cm long. Inflorescence composed of racemes; terminal and axillary; subtended by a spatheole; embraced at base by subtending leaf. Spatheole linear; 3–4 cm long; membranous; brown, or red. Peduncle 1–2 cm long; glabrous, or pilose above.

Racemes 2; paired; erect; 0.8–1 cm long; bearing few fertile spikelets; bearing 1 fertile spikelets on each. Rhachis fragile at the nodes; ciliate on margins. Rhachis hairs white. Rhachis internodes linear. Rhachis internode tip oblique; flat. Raceme-bases filiform; unequal (the longer measured); 4–7 mm long; glabrous.

Spikelets appressed; in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels linear; flattened; ciliate; tip oblique.

STERILE SPIKELETS Basal sterile spikelets well-developed; 2 in number (lower raceme); 2 in upper raceme; lanceolate; 3–5 mm long; smaller than fertile. Basal sterile spikelet glumes smooth on margins; lower glume muticous.

Companion sterile spikelets well-developed; containing empty lemmas, or male; linear, or lanceolate; dorsally compressed; 3.5–5 mm long; shorter than fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; glabrous; acute; mucronate. Companion sterile spikelet lemmas 2; enclosed by glumes.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; dorsally compressed; 5.5–6.5 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus linear; 1.5–2 mm long; pubescent; base pungent; attached obliquely.

GLUMES Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of spikelet; coriaceous; without keels; keel-less except near apex; 9 -veined. Lower glume lateral veins ribbed. Lower glume surface scabrous; rough on veins; glabrous. Lower glume apex dentate; 2 -fid. Upper glume linear; coriaceous; without keels.

FLORETS Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; 1 length of fertile lemma; hyaline; 2 -veined. Fertile lemma linear; membranous; without keel; 1 -veined. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 40–45 mm long overall; with twisted column. Column of lemma awn hirsute (rufously); with 3–5 mm long hairs. Palea absent or minute.

FLOWER Lodicules 2; cuneate; fleshy. Anthers 3. Stigmas 2.

DISTRIBUTION Africa: west tropical, west-central tropical, northeast tropical, east tropical, and southern tropical.

NOTES Andropogoneae. WDC.

ADDITIONAL CHARACTERS Peduncle hairs white.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.